Reference Guide

NOTE: You must manually enable the collection of CPU traffic statistics with the debug cpu-traffic-stats
command before the statistics display in show cpu-traffic-stats output. It is recommended that when you finish
CoPP troubleshooting, you disable the collection of CPU traffic statistics by entering the no debug cpu-traffic-
stats command.
Viewing CPU Traffic Statistics
To view the statistics collected on CPU traffic, use the show cpu-traffic-stats [cp | rp | linecard {0–2} |
all] command.
Traffic statistics are sorted on a per-interface basis; the interface receiving the most traffic is displayed first. All CPU and port
information is displayed unless you specify a port or CPU queue. Traffic information is displayed for router ports only, not for
management interfaces. CPU traffic statistics are collected only after you enter the debug cpu-traffic-stats command,
not from when the system boots up.
Dell#show cpu-traffic-stats
Processor : CP
--------------
Received 100% traffic on fortyGigE 2/12 Total packets:8
LLC:0, SNAP:0, IP:5, ARP:0, other:3
Unicast:5, Multicast:3, Broadcast:0
Processor : RP
---------------
Received 100% traffic on fortyGigE 2/12 Total packets:168
LLC:0, SNAP:0, IP:165, ARP:0, other:3
Unicast:42, Multicast:126, Broadcast:0
NOTE:
When you finish troubleshooting CoPP operation, disable the collection of CPU traffic statistics by entering the no
debug cpu-traffic-stats command.
Troubleshooting CPU Packet Loss
To troubleshoot the reason for CPU packet loss, you can display statistics about system flows on the central switch
(aggregated CoPP) or on a specified set of Z9500 ports by entering the show hardware system-flow layer2 [cp-
switch | linecard slot-id portset port-pipe] command. The number of hits for each system flow is also
displayed.
Dell#show hardware system-flow layer2 linecard 2 port-set 0
############## FP Entry for redirecting STP BPDU to CPU Port ################
EID 0x00000300: gid=0xa,
slice=9, slice_idx=0x1, part =0 prio=0x300, flags=0x10202, Installed, Enabled
tcam: color_indep=0,
Stage
InPorts
DATA=0x0000000000000000000000000000000000000000000000000000222222222222
MASK=0x0000000000000000000000000000000000000000000000000000222222222223
DstMac
Offset: 88 Width: 48
DATA=0x00000180 c2000000
MASK=0x0000ffff ffffffff
action={act=DropPrecedence, param0=1(0x1), param1=0(0), param2=0(0),
param3=0(0)}
action={act=Drop, param0=0(0), param1=0(0), param2=0(0), param3=0(0)}
action={act=CosQCpuNew, param0=0(0), param1=0(0), param2=0(0), param3=0(0)}
action={act=CopyToCpu, param0=1(0x1), param1=1(0x1), param2=0(0), param3=0(0)}
policer=
statistics={stat id 1 slice = 9 idx=0 entries=1}{Packets}
################ FP Entry for redirecting LLDP BPDU to RSM ################
EID 0x000002ff: gid=0xa,
slice=9, slice_idx=0x2, part =0 prio=0x2ff, flags=0x10202, Installed, Enabled
tcam: color_indep=0,
Control Plane Policing (CoPP)
195